Hi everyone. I'm thinking about connect arduino to a 12 V DC battery car, but i have before to find out two things:

- An electronic device, when it's connected to a battery, only gets the amp required or the battery gives more and the device breaks?

- A voltage stabilizer is good or i need one with current limit?

The thing is that i want to connect to a battery car delicated electronic (12 V stabilized, no much current) and a lipo battery charger (11-15 V, a lot of current) and i don´t know if i can use a little regulator for the first thing or it must be higher because the battery.All this it's because a battery have 13,8 V peaks, etc.

To sum up, i mainly want to know if a device "gets the amp required or the battery gives more and the device breaks" and if an stabilizer heat up although it require a little current.

An electronic device, when it's connected to a battery, only gets the amp required or the battery gives more and the device breaks?

It depends on the device you are powering. If the device is designed to be powered with 12V then that is correct. However some devices are dependent on being driven at the correct current not voltage. For example an LED needs to be driven at a fixed current not a fixed voltage.

Quote

A voltage stabilizer is good or i need one with current limit?

A voltage stabiliser is needed if the voltage you have is too large for the device you have. A stabiliser with a current limit is only useful for protection if something goes wrong. Once the protection kicks in it no longer has the same voltage output.

If the current was controlled by the supply then each and every one of us would have a serious problem in our homes. The power company supplies MEGAWATTS and we use KILOWATTS, if the device using the power was not the limiting factor on our usage our houses would have all burned down yers ago.

If the current was controlled by the supply then each and every one of us would have a serious problem in our homes. The power company supplies MEGAWATTS and we use KILOWATTS, if the device using the power was not the limiting factor on our usage our houses would have all burned down yers ago.

No, happily, they're about as ludicrously cheap as I can ever remember them.

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.Do not send technical questions via personal messaging - they will be ignored.I speak for myself, not Arduino.

No, happily, they're about as ludicrously cheap as I can ever remember them.

Correct, but I guess it depends on the users definition of 'electronics'. Apple iPhones are expensive but raw electronic components have never been cheaper in my lifetime as they are now, plus the internet opens up a worldwide seller/buyer connection making component selection and purchases easier then ever.

Bottom line, there has never been a better time to enjoy electronics as a hobby.

Interesting. Usually these are used instead of simple bus wire runs when having to use auto insertion machinery, not for hobby use. But I did a quick search on 28 gauge tinned copper bus wire and couldn't find any cheaper per foot (assuming a 2.5" resister length) then your purchase price! Of course you are limited to the pre-cut lengths of the 0 ohm resistors, where with bus wire you can use any length you require to bridge two points.

So what was your reasoning for purchasing those, just couldn't pass up a bargain?

No, happily, they're about as ludicrously cheap as I can ever remember them.

I wish but I am afraid I have to disagree with you. Like Retrolefty said, it depends on the device. I want to connect a FPV system to my car battery, and that doesn't have the resistors price, haha. Also, the Arduino to control A/V and power supply switches.